73 
DESCRIPTIONS 
BLUE- BELLIED SAW-BILLED HUMMING-BIRD 
Trochilus ihalassinus Swainson. 
Plates I. and II. 
Trochilus thalassinus, Philosophical Magazine for 1827 
L’Ana'is, Lesson, Histoire Naiurelle des Oiseaux-mouches. 
Supplement, p. 104. pi. ii. — Ramphodon anai's. Lesson, 
Trochilidees, p. 146. pis. iv. Ivi.and Ivii. 
This very fine species has been figured in the 
beautiful work of Mr Lesson, now completed, from 
which we have borrowed so largely for the illustra- 
tions of the present volume. That naturalist places 
it in his genus Ramphodon, with which it agrees in 
the structure of the bill. In other respects, however, 
it presents remarkable differences. What we have 
considered the type of Lesson’s genus has the form 
and colouring of the genus Pcethornus, and the un- 
der mandible, as in that form, sheaths itself, when 
closed, within the upper. The tail is also very much 
graduated. In the present species, we have the form 
of the wings and tail nearly as in the Mango Hum- 
* The Figures in this volume are of the natural size, 
except where otherwise mentioned. -f- PI. i. vol. i. 
